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ARS Home » Pacific West Area » Pullman, Washington » Plant Germplasm Introduction and Testing Research » Research » Publications at this Location » Publication #321243

Research Project: Management of Plant Genetic Resources and Associated Information

Location: Plant Germplasm Introduction and Testing Research

Title: Development of turf-type Poa pratensis l. germplasm for seed production without field burning

Author
item JOHNSTON, WILLIAM - Washington State University
item Johnson, Richard
item GOLOB, CHARLES - Washington State University
item DODSON, KATHLEEN - Jacklin Seed By Simplot
item NELSON, MATTHEW - Grigg Brothers
item STAHNKE, GWEN - Walla Walla Community College
item GUERTA, ELIZABETH - Auburn University

Submitted to: Athens Journal of Sciences
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/4/2015
Publication Date: 3/1/2015
Citation: Johnston, W., Johnson, R.C., Golob, C., Dodson, K., Nelson, M., Stahnke, G., Guerta, E. 2015. Development of turf-type Poa pratensis l. germplasm for seed production without field burning. Athens Journal of Sciences. 2(1):9-16.

Interpretive Summary: During the course of this long-term study we have determined that accessions in the UDSA/ARS Poa pratensis L. Plant Introduction collection could be differentiated based on phenotypic and agronomic data and a core collection was developed. In the residue management and turfgrass evaluation trials, accessions were identified that maintained good seed yield when post-harvest residue was baled and removed and also possessed good turfgrass quality. In a space-plant study, variation between and within accessions was identified; therefore, the potential exists for plant selection and enhancement. In seed production (irrigated and non-irrigated) and turfgrass trials, selection for seed yield components had a variable response; seed yield was primarily dependent on accession. PI 368241, selection panicles area-1, and Kenblue, selection seeds panicle-1, had good seed yield both irrigated and non-irrigated and fair turfgrass quality at Pullman, WA. PI 371775, selection seeds panicle-1, had good turf quality and good seed yield with irrigation. Seed increase of these three selections is currently on going at Pullman, WA and germplasm will potentially be released by 2015.

Technical Abstract: Open-field burning of Kentucky bluegrass (Poa pratensis L.) post- harvest residue, which maintains grass seed yield and stand longevity, has been eliminated in Washington and is restricted in Idaho and Oregon, USA. Our objective was to develop Kentucky bluegrass germplasm that has sustainable seed yield without field burning while maintaining acceptable turfgrass quality for use as an amenity grass. From the USDA/ARS Poa pratensis L. Plant Introduction (PI) collection, 228 accessions were evaluated in a field trial and a core collection was developed. This collection was then evaluated in seed production and turfgrass trials and those possessing both good seed yield without field burning and turfgrass quality were identified and planted in a space-plant nursery at Pullman, WA. The eight PI accessions and two commercial cultivars checks were evaluated over a 2-year period and individual plants were reselected within each accession, or check, with the highest seed weight, highest seeds panicle-1, highest panicle number area-1, and highest seed yield. Turfgrass plots were established in 2006, 2009, and 2010 at Pullman, WA, Auburn, AL, and Puyallup, WA, respectively. Seed production plots (irrigated and non-irrigated) were established at Pullman in 2007. Selection for seed yield components had a variable response and seed yield was more dependent on accession. PI 368241, selection panicles area-1, and Kenblue, selection seeds panicle-1, had the best sustainable (four harvests) seed yield without field burning in both non-irrigated and irrigated seed production plots. Both had fair turfgrass quality, whereas PI 371775, selection seeds panicle-1, had good turfgrass quality while maintaining good seed yield with irrigation. These selections have been harvested for seed increase (2012-2014) and germplasm probably will be released by 2015.